2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #ifndef __BTRFS_CTREE__
20 #define __BTRFS_CTREE__
22 #include <linux/version.h>
24 #include <linux/highmem.h>
26 #include <linux/completion.h>
27 #include <linux/backing-dev.h>
28 #include <linux/wait.h>
29 #include <asm/kmap_types.h>
30 #include "extent_io.h"
31 #include "extent_map.h"
32 #include "async-thread.h"
34 struct btrfs_trans_handle;
35 struct btrfs_transaction;
36 extern struct kmem_cache *btrfs_trans_handle_cachep;
37 extern struct kmem_cache *btrfs_transaction_cachep;
38 extern struct kmem_cache *btrfs_bit_radix_cachep;
39 extern struct kmem_cache *btrfs_path_cachep;
40 struct btrfs_ordered_sum;
42 #define BTRFS_MAGIC "_BHRfS_M"
44 #define BTRFS_ACL_NOT_CACHED ((void *)-1)
46 #define BTRFS_MAX_LEVEL 8
48 #define BTRFS_COMPAT_EXTENT_TREE_V0
51 * files bigger than this get some pre-flushing when they are added
52 * to the ordered operations list. That way we limit the total
53 * work done by the commit
55 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
57 /* holds pointers to all of the tree roots */
58 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
60 /* stores information about which extents are in use, and reference counts */
61 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
64 * chunk tree stores translations from logical -> physical block numbering
65 * the super block points to the chunk tree
67 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL
70 * stores information about which areas of a given device are in use.
71 * one per device. The tree of tree roots points to the device tree
73 #define BTRFS_DEV_TREE_OBJECTID 4ULL
75 /* one per subvolume, storing files and directories */
76 #define BTRFS_FS_TREE_OBJECTID 5ULL
78 /* directory objectid inside the root tree */
79 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
81 /* holds checksums of all the data extents */
82 #define BTRFS_CSUM_TREE_OBJECTID 7ULL
84 /* orhpan objectid for tracking unlinked/truncated files */
85 #define BTRFS_ORPHAN_OBJECTID -5ULL
87 /* does write ahead logging to speed up fsyncs */
88 #define BTRFS_TREE_LOG_OBJECTID -6ULL
89 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
91 /* for space balancing */
92 #define BTRFS_TREE_RELOC_OBJECTID -8ULL
93 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
96 * extent checksums all have this objectid
97 * this allows them to share the logging tree
100 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
102 /* dummy objectid represents multiple objectids */
103 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL
106 * All files have objectids in this range.
108 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
109 #define BTRFS_LAST_FREE_OBJECTID -256ULL
110 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
114 * the device items go into the chunk tree. The key is in the form
115 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
117 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL
120 * we can actually store much bigger names, but lets not confuse the rest
123 #define BTRFS_NAME_LEN 255
125 /* 32 bytes in various csum fields */
126 #define BTRFS_CSUM_SIZE 32
129 #define BTRFS_CSUM_TYPE_CRC32 0
131 static int btrfs_csum_sizes[] = { 4, 0 };
133 /* four bytes for CRC32 */
134 #define BTRFS_EMPTY_DIR_SIZE 0
136 #define BTRFS_FT_UNKNOWN 0
137 #define BTRFS_FT_REG_FILE 1
138 #define BTRFS_FT_DIR 2
139 #define BTRFS_FT_CHRDEV 3
140 #define BTRFS_FT_BLKDEV 4
141 #define BTRFS_FT_FIFO 5
142 #define BTRFS_FT_SOCK 6
143 #define BTRFS_FT_SYMLINK 7
144 #define BTRFS_FT_XATTR 8
145 #define BTRFS_FT_MAX 9
148 * The key defines the order in the tree, and so it also defines (optimal)
151 * objectid corresponds to the inode number.
153 * type tells us things about the object, and is a kind of stream selector.
154 * so for a given inode, keys with type of 1 might refer to the inode data,
155 * type of 2 may point to file data in the btree and type == 3 may point to
158 * offset is the starting byte offset for this key in the stream.
160 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
161 * in cpu native order. Otherwise they are identical and their sizes
162 * should be the same (ie both packed)
164 struct btrfs_disk_key {
168 } __attribute__ ((__packed__));
174 } __attribute__ ((__packed__));
176 struct btrfs_mapping_tree {
177 struct extent_map_tree map_tree;
180 #define BTRFS_UUID_SIZE 16
181 struct btrfs_dev_item {
182 /* the internal btrfs device id */
185 /* size of the device */
191 /* optimal io alignment for this device */
194 /* optimal io width for this device */
197 /* minimal io size for this device */
200 /* type and info about this device */
203 /* expected generation for this device */
207 * starting byte of this partition on the device,
208 * to allow for stripe alignment in the future
212 /* grouping information for allocation decisions */
215 /* seek speed 0-100 where 100 is fastest */
218 /* bandwidth 0-100 where 100 is fastest */
221 /* btrfs generated uuid for this device */
222 u8 uuid[BTRFS_UUID_SIZE];
224 /* uuid of FS who owns this device */
225 u8 fsid[BTRFS_UUID_SIZE];
226 } __attribute__ ((__packed__));
228 struct btrfs_stripe {
231 u8 dev_uuid[BTRFS_UUID_SIZE];
232 } __attribute__ ((__packed__));
235 /* size of this chunk in bytes */
238 /* objectid of the root referencing this chunk */
244 /* optimal io alignment for this chunk */
247 /* optimal io width for this chunk */
250 /* minimal io size for this chunk */
253 /* 2^16 stripes is quite a lot, a second limit is the size of a single
258 /* sub stripes only matter for raid10 */
260 struct btrfs_stripe stripe;
261 /* additional stripes go here */
262 } __attribute__ ((__packed__));
264 static inline unsigned long btrfs_chunk_item_size(int num_stripes)
266 BUG_ON(num_stripes == 0);
267 return sizeof(struct btrfs_chunk) +
268 sizeof(struct btrfs_stripe) * (num_stripes - 1);
271 #define BTRFS_FSID_SIZE 16
272 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
273 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
274 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
275 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
277 #define BTRFS_BACKREF_REV_MAX 256
278 #define BTRFS_BACKREF_REV_SHIFT 56
279 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
280 BTRFS_BACKREF_REV_SHIFT)
282 #define BTRFS_OLD_BACKREF_REV 0
283 #define BTRFS_MIXED_BACKREF_REV 1
286 * every tree block (leaf or node) starts with this header.
288 struct btrfs_header {
289 /* these first four must match the super block */
290 u8 csum[BTRFS_CSUM_SIZE];
291 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
292 __le64 bytenr; /* which block this node is supposed to live in */
295 /* allowed to be different from the super from here on down */
296 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
301 } __attribute__ ((__packed__));
303 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
304 sizeof(struct btrfs_header)) / \
305 sizeof(struct btrfs_key_ptr))
306 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
307 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
308 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
309 sizeof(struct btrfs_item) - \
310 sizeof(struct btrfs_file_extent_item))
314 * this is a very generous portion of the super block, giving us
315 * room to translate 14 chunks with 3 stripes each.
317 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
318 #define BTRFS_LABEL_SIZE 256
321 * the super block basically lists the main trees of the FS
322 * it currently lacks any block count etc etc
324 struct btrfs_super_block {
325 u8 csum[BTRFS_CSUM_SIZE];
326 /* the first 4 fields must match struct btrfs_header */
327 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
328 __le64 bytenr; /* this block number */
331 /* allowed to be different from the btrfs_header from here own down */
338 /* this will help find the new super based on the log root */
339 __le64 log_root_transid;
342 __le64 root_dir_objectid;
348 __le32 sys_chunk_array_size;
349 __le64 chunk_root_generation;
351 __le64 compat_ro_flags;
352 __le64 incompat_flags;
357 struct btrfs_dev_item dev_item;
359 char label[BTRFS_LABEL_SIZE];
361 /* future expansion */
363 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
364 } __attribute__ ((__packed__));
367 * Compat flags that we support. If any incompat flags are set other than the
368 * ones specified below then we will fail to mount
370 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
372 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL
373 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
374 #define BTRFS_FEATURE_INCOMPAT_SUPP \
375 BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF
378 * A leaf is full of items. offset and size tell us where to find
379 * the item in the leaf (relative to the start of the data area)
382 struct btrfs_disk_key key;
385 } __attribute__ ((__packed__));
388 * leaves have an item area and a data area:
389 * [item0, item1....itemN] [free space] [dataN...data1, data0]
391 * The data is separate from the items to get the keys closer together
395 struct btrfs_header header;
396 struct btrfs_item items[];
397 } __attribute__ ((__packed__));
400 * all non-leaf blocks are nodes, they hold only keys and pointers to
403 struct btrfs_key_ptr {
404 struct btrfs_disk_key key;
407 } __attribute__ ((__packed__));
410 struct btrfs_header header;
411 struct btrfs_key_ptr ptrs[];
412 } __attribute__ ((__packed__));
415 * btrfs_paths remember the path taken from the root down to the leaf.
416 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
417 * to any other levels that are present.
419 * The slots array records the index of the item or block pointer
420 * used while walking the tree.
423 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
424 int slots[BTRFS_MAX_LEVEL];
425 /* if there is real range locking, this locks field will change */
426 int locks[BTRFS_MAX_LEVEL];
428 /* keep some upper locks as we walk down */
432 * set by btrfs_split_item, tells search_slot to keep all locks
433 * and to force calls to keep space in the nodes
435 unsigned int search_for_split:1;
436 unsigned int keep_locks:1;
437 unsigned int skip_locking:1;
438 unsigned int leave_spinning:1;
439 unsigned int search_commit_root:1;
443 * items in the extent btree are used to record the objectid of the
444 * owner of the block and the number of references
447 struct btrfs_extent_item {
451 } __attribute__ ((__packed__));
453 struct btrfs_extent_item_v0 {
455 } __attribute__ ((__packed__));
457 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
458 sizeof(struct btrfs_item))
460 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
461 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
463 /* following flags only apply to tree blocks */
465 /* use full backrefs for extent pointers in the block */
466 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
468 struct btrfs_tree_block_info {
469 struct btrfs_disk_key key;
471 } __attribute__ ((__packed__));
473 struct btrfs_extent_data_ref {
478 } __attribute__ ((__packed__));
480 struct btrfs_shared_data_ref {
482 } __attribute__ ((__packed__));
484 struct btrfs_extent_inline_ref {
487 } __attribute__ ((__packed__));
489 /* old style backrefs item */
490 struct btrfs_extent_ref_v0 {
495 } __attribute__ ((__packed__));
498 /* dev extents record free space on individual devices. The owner
499 * field points back to the chunk allocation mapping tree that allocated
500 * the extent. The chunk tree uuid field is a way to double check the owner
502 struct btrfs_dev_extent {
504 __le64 chunk_objectid;
507 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
508 } __attribute__ ((__packed__));
510 struct btrfs_inode_ref {
514 } __attribute__ ((__packed__));
516 struct btrfs_timespec {
519 } __attribute__ ((__packed__));
521 enum btrfs_compression_type {
522 BTRFS_COMPRESS_NONE = 0,
523 BTRFS_COMPRESS_ZLIB = 1,
524 BTRFS_COMPRESS_LAST = 2,
527 struct btrfs_inode_item {
528 /* nfs style generation number */
530 /* transid that last touched this inode */
542 /* modification sequence number for NFS */
546 * a little future expansion, for more than this we can
547 * just grow the inode item and version it
550 struct btrfs_timespec atime;
551 struct btrfs_timespec ctime;
552 struct btrfs_timespec mtime;
553 struct btrfs_timespec otime;
554 } __attribute__ ((__packed__));
556 struct btrfs_dir_log_item {
558 } __attribute__ ((__packed__));
560 struct btrfs_dir_item {
561 struct btrfs_disk_key location;
566 } __attribute__ ((__packed__));
568 struct btrfs_root_item {
569 struct btrfs_inode_item inode;
575 __le64 last_snapshot;
578 struct btrfs_disk_key drop_progress;
581 } __attribute__ ((__packed__));
584 * this is used for both forward and backward root refs
586 struct btrfs_root_ref {
590 } __attribute__ ((__packed__));
592 #define BTRFS_FILE_EXTENT_INLINE 0
593 #define BTRFS_FILE_EXTENT_REG 1
594 #define BTRFS_FILE_EXTENT_PREALLOC 2
596 struct btrfs_file_extent_item {
598 * transaction id that created this extent
602 * max number of bytes to hold this extent in ram
603 * when we split a compressed extent we can't know how big
604 * each of the resulting pieces will be. So, this is
605 * an upper limit on the size of the extent in ram instead of
611 * 32 bits for the various ways we might encode the data,
612 * including compression and encryption. If any of these
613 * are set to something a given disk format doesn't understand
614 * it is treated like an incompat flag for reading and writing,
619 __le16 other_encoding; /* spare for later use */
621 /* are we inline data or a real extent? */
625 * disk space consumed by the extent, checksum blocks are included
629 __le64 disk_num_bytes;
631 * the logical offset in file blocks (no csums)
632 * this extent record is for. This allows a file extent to point
633 * into the middle of an existing extent on disk, sharing it
634 * between two snapshots (useful if some bytes in the middle of the
635 * extent have changed
639 * the logical number of file blocks (no csums included). This
640 * always reflects the size uncompressed and without encoding.
644 } __attribute__ ((__packed__));
646 struct btrfs_csum_item {
648 } __attribute__ ((__packed__));
650 /* different types of block groups (and chunks) */
651 #define BTRFS_BLOCK_GROUP_DATA (1 << 0)
652 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
653 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
654 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
655 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
656 #define BTRFS_BLOCK_GROUP_DUP (1 << 5)
657 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
659 struct btrfs_block_group_item {
661 __le64 chunk_objectid;
663 } __attribute__ ((__packed__));
665 struct btrfs_space_info {
668 u64 total_bytes; /* total bytes in the space */
669 u64 bytes_used; /* total bytes used on disk */
670 u64 bytes_pinned; /* total bytes pinned, will be freed when the
671 transaction finishes */
672 u64 bytes_reserved; /* total bytes the allocator has reserved for
673 current allocations */
674 u64 bytes_readonly; /* total bytes that are read only */
676 /* delalloc accounting */
677 u64 bytes_delalloc; /* number of bytes reserved for allocation,
678 this space is not necessarily reserved yet
680 u64 bytes_may_use; /* number of bytes that may be used for
683 int full; /* indicates that we cannot allocate any more
684 chunks for this space */
685 int force_alloc; /* set if we need to force a chunk alloc for
688 struct list_head list;
690 /* for block groups in our same type */
691 struct list_head block_groups;
693 struct rw_semaphore groups_sem;
697 * free clusters are used to claim free space in relatively large chunks,
698 * allowing us to do less seeky writes. They are used for all metadata
699 * allocations and data allocations in ssd mode.
701 struct btrfs_free_cluster {
703 spinlock_t refill_lock;
706 /* largest extent in this cluster */
709 /* first extent starting offset */
712 /* if this cluster simply points at a bitmap in the block group */
713 bool points_to_bitmap;
715 struct btrfs_block_group_cache *block_group;
717 * when a cluster is allocated from a block group, we put the
718 * cluster onto a list in the block group so that it can
719 * be freed before the block group is freed.
721 struct list_head block_group_list;
724 struct btrfs_block_group_cache {
725 struct btrfs_key key;
726 struct btrfs_block_group_item item;
728 struct mutex cache_mutex;
740 struct btrfs_space_info *space_info;
742 /* free space cache stuff */
743 spinlock_t tree_lock;
744 struct rb_root free_space_offset;
746 /* block group cache stuff */
747 struct rb_node cache_node;
749 /* for block groups in the same raid type */
750 struct list_head list;
755 /* List of struct btrfs_free_clusters for this block group.
756 * Today it will only have one thing on it, but that may change
758 struct list_head cluster_list;
761 struct reloc_control;
763 struct btrfs_fs_devices;
764 struct btrfs_fs_info {
765 u8 fsid[BTRFS_FSID_SIZE];
766 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
767 struct btrfs_root *extent_root;
768 struct btrfs_root *tree_root;
769 struct btrfs_root *chunk_root;
770 struct btrfs_root *dev_root;
771 struct btrfs_root *fs_root;
772 struct btrfs_root *csum_root;
774 /* the log root tree is a directory of all the other log roots */
775 struct btrfs_root *log_root_tree;
776 struct radix_tree_root fs_roots_radix;
778 /* block group cache stuff */
779 spinlock_t block_group_cache_lock;
780 struct rb_root block_group_cache_tree;
782 struct extent_io_tree pinned_extents;
784 /* logical->physical extent mapping */
785 struct btrfs_mapping_tree mapping_tree;
788 u64 last_trans_committed;
791 * this is updated to the current trans every time a full commit
792 * is required instead of the faster short fsync log commits
794 u64 last_trans_log_full_commit;
795 u64 open_ioctl_trans;
796 unsigned long mount_opt;
800 struct btrfs_transaction *running_transaction;
801 wait_queue_head_t transaction_throttle;
802 wait_queue_head_t transaction_wait;
803 wait_queue_head_t async_submit_wait;
805 struct btrfs_super_block super_copy;
806 struct btrfs_super_block super_for_commit;
807 struct block_device *__bdev;
808 struct super_block *sb;
809 struct inode *btree_inode;
810 struct backing_dev_info bdi;
811 struct mutex trans_mutex;
812 struct mutex tree_log_mutex;
813 struct mutex transaction_kthread_mutex;
814 struct mutex cleaner_mutex;
815 struct mutex chunk_mutex;
816 struct mutex drop_mutex;
817 struct mutex volume_mutex;
818 struct mutex tree_reloc_mutex;
821 * this protects the ordered operations list only while we are
822 * processing all of the entries on it. This way we make
823 * sure the commit code doesn't find the list temporarily empty
824 * because another function happens to be doing non-waiting preflush
825 * before jumping into the main commit.
827 struct mutex ordered_operations_mutex;
829 struct list_head trans_list;
830 struct list_head hashers;
831 struct list_head dead_roots;
833 atomic_t nr_async_submits;
834 atomic_t async_submit_draining;
835 atomic_t nr_async_bios;
836 atomic_t async_delalloc_pages;
839 * this is used by the balancing code to wait for all the pending
842 spinlock_t ordered_extent_lock;
845 * all of the data=ordered extents pending writeback
846 * these can span multiple transactions and basically include
847 * every dirty data page that isn't from nodatacow
849 struct list_head ordered_extents;
852 * all of the inodes that have delalloc bytes. It is possible for
853 * this list to be empty even when there is still dirty data=ordered
854 * extents waiting to finish IO.
856 struct list_head delalloc_inodes;
859 * special rename and truncate targets that must be on disk before
860 * we're allowed to commit. This is basically the ext3 style
863 struct list_head ordered_operations;
866 * there is a pool of worker threads for checksumming during writes
867 * and a pool for checksumming after reads. This is because readers
868 * can run with FS locks held, and the writers may be waiting for
869 * those locks. We don't want ordering in the pending list to cause
870 * deadlocks, and so the two are serviced separately.
872 * A third pool does submit_bio to avoid deadlocking with the other
875 struct btrfs_workers workers;
876 struct btrfs_workers delalloc_workers;
877 struct btrfs_workers endio_workers;
878 struct btrfs_workers endio_meta_workers;
879 struct btrfs_workers endio_meta_write_workers;
880 struct btrfs_workers endio_write_workers;
881 struct btrfs_workers submit_workers;
883 * fixup workers take dirty pages that didn't properly go through
884 * the cow mechanism and make them safe to write. It happens
885 * for the sys_munmap function call path
887 struct btrfs_workers fixup_workers;
888 struct task_struct *transaction_kthread;
889 struct task_struct *cleaner_kthread;
890 int thread_pool_size;
892 struct kobject super_kobj;
893 struct completion kobj_unregister;
896 int log_root_recovering;
900 /* protected by the delalloc lock, used to keep from writing
901 * metadata until there is a nice batch
903 u64 dirty_metadata_bytes;
904 struct list_head dirty_cowonly_roots;
906 struct btrfs_fs_devices *fs_devices;
909 * the space_info list is almost entirely read only. It only changes
910 * when we add a new raid type to the FS, and that happens
911 * very rarely. RCU is used to protect it.
913 struct list_head space_info;
915 struct reloc_control *reloc_ctl;
917 spinlock_t delalloc_lock;
918 spinlock_t new_trans_lock;
921 /* data_alloc_cluster is only used in ssd mode */
922 struct btrfs_free_cluster data_alloc_cluster;
924 /* all metadata allocations go through this cluster */
925 struct btrfs_free_cluster meta_alloc_cluster;
927 spinlock_t ref_cache_lock;
928 u64 total_ref_cache_size;
930 u64 avail_data_alloc_bits;
931 u64 avail_metadata_alloc_bits;
932 u64 avail_system_alloc_bits;
933 u64 data_alloc_profile;
934 u64 metadata_alloc_profile;
935 u64 system_alloc_profile;
937 unsigned data_chunk_allocations;
938 unsigned metadata_ratio;
944 * in ram representation of the tree. extent_root is used for all allocations
945 * and for the extent tree extent_root root.
948 struct extent_buffer *node;
950 /* the node lock is held while changing the node pointer */
951 spinlock_t node_lock;
953 struct extent_buffer *commit_root;
954 struct btrfs_root *log_root;
955 struct btrfs_root *reloc_root;
957 struct btrfs_root_item root_item;
958 struct btrfs_key root_key;
959 struct btrfs_fs_info *fs_info;
960 struct extent_io_tree dirty_log_pages;
962 struct kobject root_kobj;
963 struct completion kobj_unregister;
964 struct mutex objectid_mutex;
966 struct mutex log_mutex;
967 wait_queue_head_t log_writer_wait;
968 wait_queue_head_t log_commit_wait[2];
969 atomic_t log_writers;
970 atomic_t log_commit[2];
971 unsigned long log_transid;
972 unsigned long log_batch;
977 /* data allocations are done in sectorsize units */
980 /* node allocations are done in nodesize units */
983 /* leaf allocations are done in leafsize units */
990 u64 last_inode_alloc;
993 u64 defrag_trans_start;
994 struct btrfs_key defrag_progress;
995 struct btrfs_key defrag_max;
1001 /* the dirty list is only used by non-reference counted roots */
1002 struct list_head dirty_list;
1004 struct list_head root_list;
1006 spinlock_t list_lock;
1007 struct list_head orphan_list;
1009 spinlock_t inode_lock;
1010 /* red-black tree that keeps track of in-memory inodes */
1011 struct rb_root inode_tree;
1014 * right now this just gets used so that a root has its own devid
1015 * for stat. It may be used for more later
1017 struct super_block anon_super;
1021 * inode items have the data typically returned from stat and store other
1022 * info about object characteristics. There is one for every file and dir in
1025 #define BTRFS_INODE_ITEM_KEY 1
1026 #define BTRFS_INODE_REF_KEY 12
1027 #define BTRFS_XATTR_ITEM_KEY 24
1028 #define BTRFS_ORPHAN_ITEM_KEY 48
1029 /* reserve 2-15 close to the inode for later flexibility */
1032 * dir items are the name -> inode pointers in a directory. There is one
1033 * for every name in a directory.
1035 #define BTRFS_DIR_LOG_ITEM_KEY 60
1036 #define BTRFS_DIR_LOG_INDEX_KEY 72
1037 #define BTRFS_DIR_ITEM_KEY 84
1038 #define BTRFS_DIR_INDEX_KEY 96
1040 * extent data is for file data
1042 #define BTRFS_EXTENT_DATA_KEY 108
1045 * extent csums are stored in a separate tree and hold csums for
1046 * an entire extent on disk.
1048 #define BTRFS_EXTENT_CSUM_KEY 128
1051 * root items point to tree roots. They are typically in the root
1052 * tree used by the super block to find all the other trees
1054 #define BTRFS_ROOT_ITEM_KEY 132
1057 * root backrefs tie subvols and snapshots to the directory entries that
1060 #define BTRFS_ROOT_BACKREF_KEY 144
1063 * root refs make a fast index for listing all of the snapshots and
1064 * subvolumes referenced by a given root. They point directly to the
1065 * directory item in the root that references the subvol
1067 #define BTRFS_ROOT_REF_KEY 156
1070 * extent items are in the extent map tree. These record which blocks
1071 * are used, and how many references there are to each block
1073 #define BTRFS_EXTENT_ITEM_KEY 168
1075 #define BTRFS_TREE_BLOCK_REF_KEY 176
1077 #define BTRFS_EXTENT_DATA_REF_KEY 178
1079 #define BTRFS_EXTENT_REF_V0_KEY 180
1081 #define BTRFS_SHARED_BLOCK_REF_KEY 182
1083 #define BTRFS_SHARED_DATA_REF_KEY 184
1086 * block groups give us hints into the extent allocation trees. Which
1087 * blocks are free etc etc
1089 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1091 #define BTRFS_DEV_EXTENT_KEY 204
1092 #define BTRFS_DEV_ITEM_KEY 216
1093 #define BTRFS_CHUNK_ITEM_KEY 228
1096 * string items are for debugging. They just store a short string of
1099 #define BTRFS_STRING_ITEM_KEY 253
1101 #define BTRFS_MOUNT_NODATASUM (1 << 0)
1102 #define BTRFS_MOUNT_NODATACOW (1 << 1)
1103 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
1104 #define BTRFS_MOUNT_SSD (1 << 3)
1105 #define BTRFS_MOUNT_DEGRADED (1 << 4)
1106 #define BTRFS_MOUNT_COMPRESS (1 << 5)
1107 #define BTRFS_MOUNT_NOTREELOG (1 << 6)
1108 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1109 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1110 #define BTRFS_MOUNT_NOSSD (1 << 9)
1112 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1113 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1114 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1119 #define BTRFS_INODE_NODATASUM (1 << 0)
1120 #define BTRFS_INODE_NODATACOW (1 << 1)
1121 #define BTRFS_INODE_READONLY (1 << 2)
1122 #define BTRFS_INODE_NOCOMPRESS (1 << 3)
1123 #define BTRFS_INODE_PREALLOC (1 << 4)
1124 #define BTRFS_INODE_SYNC (1 << 5)
1125 #define BTRFS_INODE_IMMUTABLE (1 << 6)
1126 #define BTRFS_INODE_APPEND (1 << 7)
1127 #define BTRFS_INODE_NODUMP (1 << 8)
1128 #define BTRFS_INODE_NOATIME (1 << 9)
1129 #define BTRFS_INODE_DIRSYNC (1 << 10)
1132 /* some macros to generate set/get funcs for the struct fields. This
1133 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1136 #define le8_to_cpu(v) (v)
1137 #define cpu_to_le8(v) (v)
1140 #define read_eb_member(eb, ptr, type, member, result) ( \
1141 read_extent_buffer(eb, (char *)(result), \
1142 ((unsigned long)(ptr)) + \
1143 offsetof(type, member), \
1144 sizeof(((type *)0)->member)))
1146 #define write_eb_member(eb, ptr, type, member, result) ( \
1147 write_extent_buffer(eb, (char *)(result), \
1148 ((unsigned long)(ptr)) + \
1149 offsetof(type, member), \
1150 sizeof(((type *)0)->member)))
1152 #ifndef BTRFS_SETGET_FUNCS
1153 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1154 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1155 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1158 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1159 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1161 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1162 u##bits res = le##bits##_to_cpu(p->member); \
1163 kunmap_atomic(p, KM_USER0); \
1166 static inline void btrfs_set_##name(struct extent_buffer *eb, \
1169 type *p = kmap_atomic(eb->first_page, KM_USER0); \
1170 p->member = cpu_to_le##bits(val); \
1171 kunmap_atomic(p, KM_USER0); \
1174 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1175 static inline u##bits btrfs_##name(type *s) \
1177 return le##bits##_to_cpu(s->member); \
1179 static inline void btrfs_set_##name(type *s, u##bits val) \
1181 s->member = cpu_to_le##bits(val); \
1184 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1185 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1186 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1187 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1188 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1189 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1191 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1192 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1193 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1194 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1195 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1196 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1198 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1199 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1201 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1203 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1205 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1207 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1209 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1210 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1212 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1214 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1216 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1219 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1221 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1224 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1226 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1229 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1230 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1231 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1232 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1233 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1234 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1235 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1236 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1237 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1238 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1239 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1241 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1243 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1246 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1247 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1248 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1250 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1252 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1254 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1256 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1257 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1259 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1261 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1262 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1264 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1267 unsigned long offset = (unsigned long)c;
1268 offset += offsetof(struct btrfs_chunk, stripe);
1269 offset += nr * sizeof(struct btrfs_stripe);
1270 return (struct btrfs_stripe *)offset;
1273 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1275 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1278 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1279 struct btrfs_chunk *c, int nr)
1281 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1284 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1285 struct btrfs_chunk *c, int nr,
1288 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1291 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1292 struct btrfs_chunk *c, int nr)
1294 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1297 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1298 struct btrfs_chunk *c, int nr,
1301 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1304 /* struct btrfs_block_group_item */
1305 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1307 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1309 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1310 struct btrfs_block_group_item, chunk_objectid, 64);
1312 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1313 struct btrfs_block_group_item, chunk_objectid, 64);
1314 BTRFS_SETGET_FUNCS(disk_block_group_flags,
1315 struct btrfs_block_group_item, flags, 64);
1316 BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1317 struct btrfs_block_group_item, flags, 64);
1319 /* struct btrfs_inode_ref */
1320 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1321 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1323 /* struct btrfs_inode_item */
1324 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1325 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1326 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1327 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1328 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1329 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1330 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1331 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1332 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1333 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1334 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1335 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1337 static inline struct btrfs_timespec *
1338 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1340 unsigned long ptr = (unsigned long)inode_item;
1341 ptr += offsetof(struct btrfs_inode_item, atime);
1342 return (struct btrfs_timespec *)ptr;
1345 static inline struct btrfs_timespec *
1346 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1348 unsigned long ptr = (unsigned long)inode_item;
1349 ptr += offsetof(struct btrfs_inode_item, mtime);
1350 return (struct btrfs_timespec *)ptr;
1353 static inline struct btrfs_timespec *
1354 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1356 unsigned long ptr = (unsigned long)inode_item;
1357 ptr += offsetof(struct btrfs_inode_item, ctime);
1358 return (struct btrfs_timespec *)ptr;
1361 static inline struct btrfs_timespec *
1362 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1364 unsigned long ptr = (unsigned long)inode_item;
1365 ptr += offsetof(struct btrfs_inode_item, otime);
1366 return (struct btrfs_timespec *)ptr;
1369 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1370 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1372 /* struct btrfs_dev_extent */
1373 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1375 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1376 chunk_objectid, 64);
1377 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1379 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1381 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1383 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1384 return (u8 *)((unsigned long)dev + ptr);
1387 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1388 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1390 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1392 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1395 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1397 static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1398 struct btrfs_tree_block_info *item,
1399 struct btrfs_disk_key *key)
1401 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1404 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1405 struct btrfs_tree_block_info *item,
1406 struct btrfs_disk_key *key)
1408 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1411 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1413 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1415 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1417 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1420 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1423 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1425 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1428 static inline u32 btrfs_extent_inline_ref_size(int type)
1430 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1431 type == BTRFS_SHARED_BLOCK_REF_KEY)
1432 return sizeof(struct btrfs_extent_inline_ref);
1433 if (type == BTRFS_SHARED_DATA_REF_KEY)
1434 return sizeof(struct btrfs_shared_data_ref) +
1435 sizeof(struct btrfs_extent_inline_ref);
1436 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1437 return sizeof(struct btrfs_extent_data_ref) +
1438 offsetof(struct btrfs_extent_inline_ref, offset);
1443 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1444 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1446 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1447 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1449 /* struct btrfs_node */
1450 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1451 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1453 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1456 ptr = offsetof(struct btrfs_node, ptrs) +
1457 sizeof(struct btrfs_key_ptr) * nr;
1458 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1461 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1465 ptr = offsetof(struct btrfs_node, ptrs) +
1466 sizeof(struct btrfs_key_ptr) * nr;
1467 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1470 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1473 ptr = offsetof(struct btrfs_node, ptrs) +
1474 sizeof(struct btrfs_key_ptr) * nr;
1475 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1478 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1482 ptr = offsetof(struct btrfs_node, ptrs) +
1483 sizeof(struct btrfs_key_ptr) * nr;
1484 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1487 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1489 return offsetof(struct btrfs_node, ptrs) +
1490 sizeof(struct btrfs_key_ptr) * nr;
1493 void btrfs_node_key(struct extent_buffer *eb,
1494 struct btrfs_disk_key *disk_key, int nr);
1496 static inline void btrfs_set_node_key(struct extent_buffer *eb,
1497 struct btrfs_disk_key *disk_key, int nr)
1500 ptr = btrfs_node_key_ptr_offset(nr);
1501 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1502 struct btrfs_key_ptr, key, disk_key);
1505 /* struct btrfs_item */
1506 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1507 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1509 static inline unsigned long btrfs_item_nr_offset(int nr)
1511 return offsetof(struct btrfs_leaf, items) +
1512 sizeof(struct btrfs_item) * nr;
1515 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1518 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1521 static inline u32 btrfs_item_end(struct extent_buffer *eb,
1522 struct btrfs_item *item)
1524 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1527 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1529 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1532 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1534 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1537 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1539 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1542 static inline void btrfs_item_key(struct extent_buffer *eb,
1543 struct btrfs_disk_key *disk_key, int nr)
1545 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1546 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1549 static inline void btrfs_set_item_key(struct extent_buffer *eb,
1550 struct btrfs_disk_key *disk_key, int nr)
1552 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1553 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1556 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1559 * struct btrfs_root_ref
1561 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1562 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1563 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1565 /* struct btrfs_dir_item */
1566 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1567 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1568 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1569 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1571 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1572 struct btrfs_dir_item *item,
1573 struct btrfs_disk_key *key)
1575 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1578 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1579 struct btrfs_dir_item *item,
1580 struct btrfs_disk_key *key)
1582 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1585 /* struct btrfs_disk_key */
1586 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1588 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1589 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1591 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1592 struct btrfs_disk_key *disk)
1594 cpu->offset = le64_to_cpu(disk->offset);
1595 cpu->type = disk->type;
1596 cpu->objectid = le64_to_cpu(disk->objectid);
1599 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1600 struct btrfs_key *cpu)
1602 disk->offset = cpu_to_le64(cpu->offset);
1603 disk->type = cpu->type;
1604 disk->objectid = cpu_to_le64(cpu->objectid);
1607 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1608 struct btrfs_key *key, int nr)
1610 struct btrfs_disk_key disk_key;
1611 btrfs_node_key(eb, &disk_key, nr);
1612 btrfs_disk_key_to_cpu(key, &disk_key);
1615 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1616 struct btrfs_key *key, int nr)
1618 struct btrfs_disk_key disk_key;
1619 btrfs_item_key(eb, &disk_key, nr);
1620 btrfs_disk_key_to_cpu(key, &disk_key);
1623 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1624 struct btrfs_dir_item *item,
1625 struct btrfs_key *key)
1627 struct btrfs_disk_key disk_key;
1628 btrfs_dir_item_key(eb, item, &disk_key);
1629 btrfs_disk_key_to_cpu(key, &disk_key);
1633 static inline u8 btrfs_key_type(struct btrfs_key *key)
1638 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1643 /* struct btrfs_header */
1644 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1645 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1647 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1648 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1649 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1650 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1652 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1654 return (btrfs_header_flags(eb) & flag) == flag;
1657 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1659 u64 flags = btrfs_header_flags(eb);
1660 btrfs_set_header_flags(eb, flags | flag);
1661 return (flags & flag) == flag;
1664 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1666 u64 flags = btrfs_header_flags(eb);
1667 btrfs_set_header_flags(eb, flags & ~flag);
1668 return (flags & flag) == flag;
1671 static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1673 u64 flags = btrfs_header_flags(eb);
1674 return flags >> BTRFS_BACKREF_REV_SHIFT;
1677 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1680 u64 flags = btrfs_header_flags(eb);
1681 flags &= ~BTRFS_BACKREF_REV_MASK;
1682 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1683 btrfs_set_header_flags(eb, flags);
1686 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1688 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1692 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1694 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1698 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1700 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1704 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1706 unsigned long ptr = offsetof(struct btrfs_header, csum);
1710 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1715 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1720 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1725 static inline int btrfs_is_leaf(struct extent_buffer *eb)
1727 return btrfs_header_level(eb) == 0;
1730 /* struct btrfs_root_item */
1731 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1733 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1734 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1735 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1737 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1739 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1740 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1741 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1742 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1743 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1744 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1745 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1746 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1749 /* struct btrfs_super_block */
1751 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1752 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1753 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1755 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1756 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1757 struct btrfs_super_block, sys_chunk_array_size, 32);
1758 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1759 struct btrfs_super_block, chunk_root_generation, 64);
1760 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1762 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1764 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1765 chunk_root_level, 8);
1766 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1768 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
1769 log_root_transid, 64);
1770 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1772 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1774 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1776 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1778 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1780 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1782 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1784 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1785 root_dir_objectid, 64);
1786 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1788 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
1790 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
1792 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
1793 incompat_flags, 64);
1794 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
1797 static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
1799 int t = btrfs_super_csum_type(s);
1800 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
1801 return btrfs_csum_sizes[t];
1804 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1806 return offsetof(struct btrfs_leaf, items);
1809 /* struct btrfs_file_extent_item */
1810 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1812 static inline unsigned long
1813 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
1815 unsigned long offset = (unsigned long)e;
1816 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1820 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1822 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1825 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1827 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1829 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1830 disk_num_bytes, 64);
1831 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1833 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1835 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1837 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1839 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1841 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1842 other_encoding, 16);
1844 /* this returns the number of file bytes represented by the inline item.
1845 * If an item is compressed, this is the uncompressed size
1847 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1848 struct btrfs_file_extent_item *e)
1850 return btrfs_file_extent_ram_bytes(eb, e);
1854 * this returns the number of bytes used by the item on disk, minus the
1855 * size of any extent headers. If a file is compressed on disk, this is
1856 * the compressed size
1858 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1859 struct btrfs_item *e)
1861 unsigned long offset;
1862 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1863 return btrfs_item_size(eb, e) - offset;
1866 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1868 return sb->s_fs_info;
1871 static inline int btrfs_set_root_name(struct btrfs_root *root,
1872 const char *name, int len)
1874 /* if we already have a name just free it */
1877 root->name = kmalloc(len+1, GFP_KERNEL);
1881 memcpy(root->name, name, len);
1882 root->name[len] = '\0';
1887 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1890 return root->leafsize;
1891 return root->nodesize;
1894 /* helper function to cast into the data area of the leaf. */
1895 #define btrfs_item_ptr(leaf, slot, type) \
1896 ((type *)(btrfs_leaf_data(leaf) + \
1897 btrfs_item_offset_nr(leaf, slot)))
1899 #define btrfs_item_ptr_offset(leaf, slot) \
1900 ((unsigned long)(btrfs_leaf_data(leaf) + \
1901 btrfs_item_offset_nr(leaf, slot)))
1903 static inline struct dentry *fdentry(struct file *file)
1905 return file->f_path.dentry;
1909 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1910 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
1911 struct btrfs_root *root, unsigned long count);
1912 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1913 int btrfs_update_pinned_extents(struct btrfs_root *root,
1914 u64 bytenr, u64 num, int pin);
1915 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1916 struct btrfs_root *root, struct extent_buffer *leaf);
1917 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1918 struct btrfs_root *root,
1919 u64 objectid, u64 offset, u64 bytenr);
1920 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1921 struct btrfs_block_group_cache *btrfs_lookup_block_group(
1922 struct btrfs_fs_info *info,
1924 void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
1925 u64 btrfs_find_block_group(struct btrfs_root *root,
1926 u64 search_start, u64 search_hint, int owner);
1927 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1928 struct btrfs_root *root, u32 blocksize,
1929 u64 parent, u64 root_objectid,
1930 struct btrfs_disk_key *key, int level,
1931 u64 hint, u64 empty_size);
1932 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1933 struct btrfs_root *root,
1934 u64 bytenr, u32 blocksize,
1936 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
1937 struct btrfs_root *root,
1938 u64 root_objectid, u64 owner,
1939 u64 offset, struct btrfs_key *ins);
1940 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
1941 struct btrfs_root *root,
1942 u64 root_objectid, u64 owner, u64 offset,
1943 struct btrfs_key *ins);
1944 int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1945 struct btrfs_root *root,
1946 u64 num_bytes, u64 min_alloc_size,
1947 u64 empty_size, u64 hint_byte,
1948 u64 search_end, struct btrfs_key *ins,
1950 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1951 struct extent_buffer *buf, int full_backref);
1952 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1953 struct extent_buffer *buf, int full_backref);
1954 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
1955 struct btrfs_root *root,
1956 u64 bytenr, u64 num_bytes, u64 flags,
1958 int btrfs_free_extent(struct btrfs_trans_handle *trans,
1959 struct btrfs_root *root,
1960 u64 bytenr, u64 num_bytes, u64 parent,
1961 u64 root_objectid, u64 owner, u64 offset);
1963 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
1964 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1965 struct btrfs_root *root,
1966 struct extent_io_tree *unpin);
1967 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1968 struct btrfs_root *root,
1969 u64 bytenr, u64 num_bytes, u64 parent,
1970 u64 root_objectid, u64 owner, u64 offset);
1972 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1973 struct btrfs_root *root);
1974 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
1975 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1976 int btrfs_read_block_groups(struct btrfs_root *root);
1977 int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1978 struct btrfs_root *root, u64 bytes_used,
1979 u64 type, u64 chunk_objectid, u64 chunk_offset,
1981 int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
1982 struct btrfs_root *root, u64 group_start);
1983 int btrfs_prepare_block_group_relocation(struct btrfs_root *root,
1984 struct btrfs_block_group_cache *group);
1986 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
1987 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
1988 void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
1990 int btrfs_check_metadata_free_space(struct btrfs_root *root);
1991 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
1993 void btrfs_free_reserved_data_space(struct btrfs_root *root,
1994 struct inode *inode, u64 bytes);
1995 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
1997 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
2000 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2001 int level, int *slot);
2002 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2003 int btrfs_previous_item(struct btrfs_root *root,
2004 struct btrfs_path *path, u64 min_objectid,
2006 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2007 struct btrfs_root *root, struct btrfs_path *path,
2008 struct btrfs_key *new_key);
2009 struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2010 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2011 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2012 struct btrfs_key *key, int lowest_level,
2013 int cache_only, u64 min_trans);
2014 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2015 struct btrfs_key *max_key,
2016 struct btrfs_path *path, int cache_only,
2018 int btrfs_cow_block(struct btrfs_trans_handle *trans,
2019 struct btrfs_root *root, struct extent_buffer *buf,
2020 struct extent_buffer *parent, int parent_slot,
2021 struct extent_buffer **cow_ret);
2022 int btrfs_copy_root(struct btrfs_trans_handle *trans,
2023 struct btrfs_root *root,
2024 struct extent_buffer *buf,
2025 struct extent_buffer **cow_ret, u64 new_root_objectid);
2026 int btrfs_block_can_be_shared(struct btrfs_root *root,
2027 struct extent_buffer *buf);
2028 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2029 *root, struct btrfs_path *path, u32 data_size);
2030 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2031 struct btrfs_root *root,
2032 struct btrfs_path *path,
2033 u32 new_size, int from_end);
2034 int btrfs_split_item(struct btrfs_trans_handle *trans,
2035 struct btrfs_root *root,
2036 struct btrfs_path *path,
2037 struct btrfs_key *new_key,
2038 unsigned long split_offset);
2039 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2040 *root, struct btrfs_key *key, struct btrfs_path *p, int
2042 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2043 struct btrfs_root *root, struct extent_buffer *parent,
2044 int start_slot, int cache_only, u64 *last_ret,
2045 struct btrfs_key *progress);
2046 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
2047 struct btrfs_path *btrfs_alloc_path(void);
2048 void btrfs_free_path(struct btrfs_path *p);
2049 void btrfs_set_path_blocking(struct btrfs_path *p);
2050 void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2052 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2053 struct btrfs_path *path, int slot, int nr);
2054 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2055 struct btrfs_root *root,
2056 struct btrfs_path *path)
2058 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2061 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2062 *root, struct btrfs_key *key, void *data, u32 data_size);
2063 int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
2064 struct btrfs_root *root,
2065 struct btrfs_path *path,
2066 struct btrfs_key *cpu_key, u32 *data_size,
2068 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2069 struct btrfs_root *root,
2070 struct btrfs_path *path,
2071 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2073 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2074 struct btrfs_root *root,
2075 struct btrfs_path *path,
2076 struct btrfs_key *key,
2079 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2082 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2083 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2084 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2085 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref);
2086 int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2087 struct btrfs_root *root,
2088 struct extent_buffer *node,
2089 struct extent_buffer *parent);
2091 int btrfs_find_root_ref(struct btrfs_root *tree_root,
2092 struct btrfs_path *path,
2093 u64 root_id, u64 ref_id);
2094 int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2095 struct btrfs_root *tree_root,
2096 u64 root_id, u8 type, u64 ref_id,
2097 u64 dirid, u64 sequence,
2098 const char *name, int name_len);
2099 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2100 struct btrfs_key *key);
2101 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2102 *root, struct btrfs_key *key, struct btrfs_root_item
2104 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2105 *root, struct btrfs_key *key, struct btrfs_root_item
2107 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2108 btrfs_root_item *item, struct btrfs_key *key);
2109 int btrfs_search_root(struct btrfs_root *root, u64 search_start,
2110 u64 *found_objectid);
2111 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2112 int btrfs_set_root_node(struct btrfs_root_item *item,
2113 struct extent_buffer *node);
2115 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2116 struct btrfs_root *root, const char *name,
2117 int name_len, u64 dir,
2118 struct btrfs_key *location, u8 type, u64 index);
2119 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2120 struct btrfs_root *root,
2121 struct btrfs_path *path, u64 dir,
2122 const char *name, int name_len,
2124 struct btrfs_dir_item *
2125 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2126 struct btrfs_root *root,
2127 struct btrfs_path *path, u64 dir,
2128 u64 objectid, const char *name, int name_len,
2130 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2131 struct btrfs_path *path,
2132 const char *name, int name_len);
2133 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2134 struct btrfs_root *root,
2135 struct btrfs_path *path,
2136 struct btrfs_dir_item *di);
2137 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2138 struct btrfs_root *root, const char *name,
2139 u16 name_len, const void *data, u16 data_len,
2141 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2142 struct btrfs_root *root,
2143 struct btrfs_path *path, u64 dir,
2144 const char *name, u16 name_len,
2148 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2149 struct btrfs_root *root, u64 offset);
2150 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2151 struct btrfs_root *root, u64 offset);
2154 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
2155 struct btrfs_root *fs_root,
2156 u64 dirid, u64 *objectid);
2157 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
2160 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2161 struct btrfs_root *root,
2162 const char *name, int name_len,
2163 u64 inode_objectid, u64 ref_objectid, u64 index);
2164 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2165 struct btrfs_root *root,
2166 const char *name, int name_len,
2167 u64 inode_objectid, u64 ref_objectid, u64 *index);
2168 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2169 struct btrfs_root *root,
2170 struct btrfs_path *path, u64 objectid);
2171 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2172 *root, struct btrfs_path *path,
2173 struct btrfs_key *location, int mod);
2176 int btrfs_del_csums(struct btrfs_trans_handle *trans,
2177 struct btrfs_root *root, u64 bytenr, u64 len);
2178 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2179 struct bio *bio, u32 *dst);
2180 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2181 struct btrfs_root *root,
2182 u64 objectid, u64 pos,
2183 u64 disk_offset, u64 disk_num_bytes,
2184 u64 num_bytes, u64 offset, u64 ram_bytes,
2185 u8 compression, u8 encryption, u16 other_encoding);
2186 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2187 struct btrfs_root *root,
2188 struct btrfs_path *path, u64 objectid,
2189 u64 bytenr, int mod);
2190 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2191 struct btrfs_root *root,
2192 struct btrfs_ordered_sum *sums);
2193 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2194 struct bio *bio, u64 file_start, int contig);
2195 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
2196 u64 start, unsigned long len);
2197 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2198 struct btrfs_root *root,
2199 struct btrfs_path *path,
2200 u64 bytenr, int cow);
2201 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2202 struct btrfs_root *root, struct btrfs_path *path,
2204 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start,
2205 u64 end, struct list_head *list);
2208 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2209 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2210 #define ClearPageChecked ClearPageFsMisc
2211 #define SetPageChecked SetPageFsMisc
2212 #define PageChecked PageFsMisc
2215 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2216 int btrfs_set_inode_index(struct inode *dir, u64 *index);
2217 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2218 struct btrfs_root *root,
2219 struct inode *dir, struct inode *inode,
2220 const char *name, int name_len);
2221 int btrfs_add_link(struct btrfs_trans_handle *trans,
2222 struct inode *parent_inode, struct inode *inode,
2223 const char *name, int name_len, int add_backref, u64 index);
2224 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2225 struct btrfs_root *root,
2226 struct inode *inode, u64 new_size,
2229 int btrfs_start_delalloc_inodes(struct btrfs_root *root);
2230 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
2231 int btrfs_writepages(struct address_space *mapping,
2232 struct writeback_control *wbc);
2233 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2234 struct btrfs_root *new_root, struct dentry *dentry,
2235 u64 new_dirid, u64 alloc_hint);
2236 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2237 size_t size, struct bio *bio, unsigned long bio_flags);
2239 unsigned long btrfs_force_ra(struct address_space *mapping,
2240 struct file_ra_state *ra, struct file *file,
2241 pgoff_t offset, pgoff_t last_index);
2242 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2243 int btrfs_readpage(struct file *file, struct page *page);
2244 void btrfs_delete_inode(struct inode *inode);
2245 void btrfs_put_inode(struct inode *inode);
2246 int btrfs_write_inode(struct inode *inode, int wait);
2247 void btrfs_dirty_inode(struct inode *inode);
2248 struct inode *btrfs_alloc_inode(struct super_block *sb);
2249 void btrfs_destroy_inode(struct inode *inode);
2250 int btrfs_init_cachep(void);
2251 void btrfs_destroy_cachep(void);
2252 long btrfs_ioctl_trans_end(struct file *file);
2253 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2254 struct btrfs_root *root);
2255 int btrfs_commit_write(struct file *file, struct page *page,
2256 unsigned from, unsigned to);
2257 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2258 size_t page_offset, u64 start, u64 end,
2260 int btrfs_update_inode(struct btrfs_trans_handle *trans,
2261 struct btrfs_root *root,
2262 struct inode *inode);
2263 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2264 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2265 void btrfs_orphan_cleanup(struct btrfs_root *root);
2266 int btrfs_cont_expand(struct inode *inode, loff_t size);
2269 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2270 void btrfs_update_iflags(struct inode *inode);
2271 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2274 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
2275 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2277 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
2278 extern struct file_operations btrfs_file_operations;
2279 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
2280 struct btrfs_root *root, struct inode *inode,
2281 u64 start, u64 end, u64 locked_end,
2282 u64 inline_limit, u64 *hint_block);
2283 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2284 struct btrfs_root *root,
2285 struct inode *inode, u64 start, u64 end);
2286 int btrfs_release_file(struct inode *inode, struct file *file);
2289 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2290 struct btrfs_root *root, int cache_only);
2293 int btrfs_init_sysfs(void);
2294 void btrfs_exit_sysfs(void);
2295 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2296 int btrfs_sysfs_add_root(struct btrfs_root *root);
2297 void btrfs_sysfs_del_root(struct btrfs_root *root);
2298 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2301 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2304 u64 btrfs_parse_size(char *str);
2305 int btrfs_parse_options(struct btrfs_root *root, char *options);
2306 int btrfs_sync_fs(struct super_block *sb, int wait);
2309 #ifdef CONFIG_FS_POSIX_ACL
2310 int btrfs_check_acl(struct inode *inode, int mask);
2312 #define btrfs_check_acl NULL
2314 int btrfs_init_acl(struct inode *inode, struct inode *dir);
2315 int btrfs_acl_chmod(struct inode *inode);
2318 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2319 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2320 struct btrfs_root *root);
2321 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2322 struct btrfs_root *root);
2323 int btrfs_recover_relocation(struct btrfs_root *root);
2324 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);